The utility model provides a building node is waterproof structure, at least includes the well lid board, sump pit, apopore, bottom plate, plain soil, brick child mould, PVC pipe, rubble hole, rubble, concrete bed course, steel plate, angle steel and cement mortar, the well lid board sets up at the sump pit top to closely cooperate with the sump pit top and be connected, be provided with the apopore in the sump pit middle part, the bottom plate sets up between sump pit lateral wall and concrete bed course upper surface, PVC pipe both ends head sets up between concrete bed course and plain soil to PVC pipe lower extreme embedding rubble hole is inside, the rubble hole sets up the right side below in the sump pit bottom to rubble hole upper surface and the inseparable adhesion of concrete bed course and rubble hole lateral wall and plain native adhesion, the inside evenly distributed in hole the rubble at the rubble, the steel plate sets up between angle steel and cement mortar to the welding together between angle steel and the back steel sheet, this simple structure connects closely, and the prevention of seepage is effectual, and the practicality is strong, easily uses widely